Culturable Commanded Area (CCA) definition — identify the incorrect deduction when computing CCA from Gross Commanded Area (GCA).
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ASubtract populated area (villages, roads, buildings).
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BSubtract alkaline/saline patches permanently unculturable.
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CSubtract forest area and rocky outcrops.
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DSubtract fallow land.
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ESubtract water bodies and permanent waste.
Answer
Correct Answer: Subtract fallow land.
Explanation
Introduction / Context:Planning an irrigation project requires distinguishing the land actually cultivable under a canal system. Culturable Commanded Area (CCA) is derived from the Gross Commanded Area (GCA) by excluding permanently unculturable categories, not land that is simply left uncropped in a given season (fallow).
Given Data / Assumptions:
- GCA includes all land topographically commanded by the project.
- We remove areas that are intrinsically not cultivable.
- Fallow land is considered potentially cultivable (culturable).
Concept / Approach:
CCA = GCA − (permanently unculturable lands such as settlements, roads, forests, rocky patches, water bodies, alkaline wastelands). Seasonal fallow remains within CCA because it can be cultivated when water and agronomy permit. Hence subtracting fallow is incorrect.
Step-by-Step Solution:
List unculturable lands → settlements, forests, rocky waste, saline-alkaline hard pans, water bodies.Retain fallow as culturable → do not subtract.Therefore the incorrect deduction is “Subtract fallow land.”Verification / Alternative check (if short method exists):
Check project planning manuals: CCA serves as the basis for cropping intensity and water duty; fallow is part of the rotation within CCA.
Why Other Options Are Wrong:
Options A, B, C, and E correctly identify unculturable deductions. Only D conflicts with standard definitions.
Common Pitfalls (misconceptions, mistakes):
Confusing “fallow” with “unculturable”; miscounting double-cropped area as additional CCA (it affects cropping intensity, not CCA).
Final Answer:
Subtract fallow land.